Wasn't it Rick Measham who wrote:
>
>There'd be neutral gravity on the inside, but if you spin the sphere 
>fast enough, then momentum-in-a-circular-restriction (aka centrifical 
>force) will stick you to the sphere. Something like 32km/s (or 320 .. 
>it's been a while) for a 1AU sphere.

But only the people standing on the equator would get vertical gravity
at full strength.

The strength of the force varies with cos(latitude) and the angle to the
local vertical is proportional to latitude. So people standing near the
poles get very little force, and what force there is would be almost
horizontal.

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